Exercise machine



FIG. 1 is a top, front and left side perspective view of an exercise machine showing our new design;

FIG. 2 is a right side elevation thereof;

FIG. 3 is a front elevation thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a rear elevation thereof.

The left side elevation is a mirror image of the right side elevation. The bottom is free of ornamentation. 

We claim the ornamental design for an exercise machine, as shown. 